Semi-Virtual Reality Audio-Video Offset for Sports Training
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Solution Overview
Problem
Sports training in a semi-virtual reality environment using flat displays results in delayed physical reactions compared to real and virtual reality environments due to difficulty in determining the spatial position of incoming objects, leading to a significant delay in reaction time.
Innovation Solution
A video and audio presentation device that calculates a time-series offset based on the scale ratio between environments and adjusts audio presentation to precede video presentation, reducing the delay in physical reactions by shifting audio to synchronize with the expected arrival of the video in the semi-virtual reality environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sports training is performed in a semi-virtual reality environment using flat displays, then equipment preparation becomes easier, but subject's physical reaction time is delayed compared to real and virtual reality environments
Solution Approach 1:
The system performs preliminary actions by calculating the time difference between real environment and semi-virtual environment reactions, then pre-adjusts the video presentation timing by applying an offset to synchronize the video arrival time with the subject's expected reaction time, thereby compensating for the delay before training begins
Solution Approach 2:
The system changes the timing parameter of video presentation by applying a calculated offset to the video start time, adjusting it to match the subject's reaction characteristics in the semi-virtual environment, thereby transforming the delayed reaction into synchronized response
2Device complexity
If video is presented in a semi-virtual reality environment on flat displays, then equipment complexity is reduced, but subject's ability to determine spatial position of incoming objects deteriorates
Solution Approach 1:
The system introduces an intermediary mechanism by calculating the time difference between real and virtual environments and applying this as a temporal offset to video presentation, mediating between the flat display environment and the subject's reaction to improve spatial position determination accuracy
3Reliability
If audio is synchronized with video in real-time without offset adjustment, then audio-video synchronization is maintained, but the audio does not precede video arrival to account for delayed physical reaction
Solution Approach 1:
The system performs preliminary action by calculating the time offset based on the difference between real and semi-virtual environment reactions, then applying this offset in advance to the video presentation timing, ensuring that video arrives at the subject at the appropriate moment relative to audio
Solution Approach 2:
The system applies dynamic adjustment by calculating the offset based on scale ratios between different environments and applying this temporal transformation to synchronize video arrival with subject reaction timing, making the presentation adaptive to the semi-virtual environment characteristics
Data Source
AI summary
A video and audio presentation device configured to present video and audio for sports training with less delay in physical reaction is provided. The device includes: an offset determination unit configured to determine a time-series offset toffset obtained by correcting a time difference tdiff on a basis of a correction coefficient α, the time difference tdiff representing a time difference between Areal and Amix, or a time difference between AVR and Amix, where a physical reaction Areal represents time-series data of physical reaction to an incoming object in a real environment, a physical reaction AVR represents time-series data of physical reaction to an incoming object presented in a virtual reality environment, and a physical reaction Amix represents time-series data of physical reaction to an incoming object presented in a semi-virtual reality environment; a video presentation unit configured to present video in the semi-virtual reality environment; and an audio presentation unit configured to shift audio corresponding to the video on a basis of the time-series offset toffset so that the audio precedes arrival of the video, and to present the shifted audio in the semi-virtual reality environment.